MNT add python version requirement (#289)

Co-authored-by: mathurinm <mathurin.massias@gmail.com>

Author: jolars

.circleci/config.yml

@@ -2,7 +2,7 @@ version: 2
 jobs:
     build_docs:
       docker:
-        - image: circleci/python:3.8.1-buster
+        - image: cimg/python:3.10
       steps:
         - checkout
         - run:
@@ -32,6 +32,13 @@ jobs:
             keys:
               - pip-cache
 
+        # Install Xvfb and related dependencies
+        - run:
+            name: Install Xvfb and dependencies
+            command: |
+              sudo apt-get update
+              sudo apt-get install -y xvfb
+
         - run:
             name: Spin up Xvfb
             command: |

pyproject.toml

@@ -22,6 +22,16 @@ dependencies = [
 ]
 dynamic = ["version"]
 
+requires-python = ">=3.9"
+
+classifiers = [
+  "Programming Language :: Python :: 3 :: Only",
+  "Programming Language :: Python :: 3.9",
+  "Programming Language :: Python :: 3.10",
+  "Programming Language :: Python :: 3.11",
+  "Programming Language :: Python :: 3.12",
+  "Programming Language :: Python :: 3.13",
+]
 
 [tool.setuptools.dynamic]
 version = {attr = "skglm.__version__"}